body {
    display: flex;
    margin: 0;
    min-height: 100vh;
}

.left {
    background-color: #eee;
    position: relative;
    min-width: 100px;
}

.left .separator {
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    top: 0;
    right: 0;
    width: 14px;
    height: 100%;
    background-color: white;
    box-shadow: 0px 0px 2px rgba(0, 0, 0, .35);
    cursor:col-resize;
}

.left .separator i {
    display: inline-block;
    height: 14px;
    width: 1px;
    background-color: #e9e9e9;
    margin: 0 1px;
}

.content {
    padding: 20px;
}

.main {
    background-color: white;
    flex: 1;
}

.left .content img {
    display: block;
    max-width: 100%;
    margin: auto;
}